Fully agree with Sajeet. Why didn't you just log in to AdWords (you don't even need to have any campaigns running and it's free), I made a similar search for [blog traffic] and got 554 keyword ideas.

For sure, it's not really fair of Google to hide functionality this way, making more people sign up for AdWords, but it's not right either to throw mud on one of the most profound keyword tools of all SEO times!